Author Takata, Shingo| Ashida, Kozo| Hosaki, Yasuhiro| Hamada, Masanori| Iwagaki, Naofumi| Kikuchi, Hiroshi| Mitsunobu, Fumihiro|
Published Date 2008-03-01
Publication Title 岡大三朝医療センター研究報告
Volume volume76
Content Type Departmental Bulletin Paper
Author Takata, Shingo| Ashida, Kozo| Hosaki, Yasuhiro| Hamada, Masanori| Iwagaki, Naofumi| Kikuchi, Hiroshi| Mitsunobu, Fumihiro|
Published Date 2008-03-01
Publication Title 岡大三朝医療センター研究報告
Volume volume76
Content Type Departmental Bulletin Paper
JaLCDOI 10.18926/19957
FullText URL Mem_Fac_Eng_OU_44_32.pdf
Author Kanatani, Kenichi| Niitsuma Hirotaka| Sugaya Yasuyuki|
Abstract We present an alternative approach to what we call the “standard optimization”, which minimizes a cost function by searching a parameter space. Instead, the input is “orthogonally projected” in the joint input space onto the manifold defined by the “consistency constraint”, which demands that any minimal subset of observations produce the same result. This approach avoids many difficulties encountered in the standard optimization. As typical examples, we apply it to line fitting and multiview triangulation. The latter produces a new algorithm far more efficient than existing methods. We also discuss optimality of our approach.
Publication Title Memoirs of the Faculty of Engineering, Okayama University
Published Date 2010-01
Volume volume44
Start Page 32
End Page 41
ISSN 1349-6115
language 英語
File Version publisher
NAID 120002309124
JaLCDOI 10.18926/19959
FullText URL Mem_Fac_Eng_OU_44_50.pdf
Author Kanatani, Kenichi| Niitsuma Hirotaka| Rangrajan Prasanna|
Abstract We present highly accurate least-squares (LS) alternatives to the theoretically optimal maximum likelihood (ML) estimator for homographies between two images. Unlike ML, our estimators are non-iterative and yield solutions even in the presence of large noise. By rigorous error analysis, we derive a “hyperaccurate” estimator which is unbiased up to second order noise terms. Then, we introduce a computational simplification, which we call “Taubin approximation”, without incurring a loss in accuracy. We experimentally demonstrate that our estimators have accuracy surpassing the traditional LS estimator and comparable to the ML estimator.
Publication Title Memoirs of the Faculty of Engineering, Okayama University
Published Date 2010-01
Volume volume44
Start Page 50
End Page 59
ISSN 1349-6115
language 英語
File Version publisher
NAID 120002308986
JaLCDOI 10.18926/44496
FullText URL mfe_045_015_026.pdf
Author Kanatani, Kenichi| Rangrajan, Prasanna| Sugaya, Yasuyuki| Niitsuma, Hirotaka|
Abstract We present a new least squares (LS) estimator, called “HyperLS”, specifically designed for parameter estimation in computer vision applications. It minimizes the algebraic distance under a special scale normalization, which is derived by rigorous error analysis in such a way that statistical bias is removed up to second order noise terms. Numerical experiments suggest that our HyperLS is far superior to the standard LS and comparable in accuracy to maximum likelihood (ML), which is known to produce highly accurate results in image applications but may fail to converge if poorly initialized. Our HyperLS is a perfect candidate for ML initialization. In addition, we discuss how image-based inference problems have different characteristics form conventional statistical applications, with a view to serving as a bridge between mathematicians and computer engineers.
Publication Title Memoirs of the Faculty of Engineering, Okayama University
Published Date 2011-01
Volume volume45
Start Page 15
End Page 26
ISSN 1349-6115
language 英語
Copyright Holders Copyright © by the authors
File Version publisher
NAID 120002905952
JaLCDOI 10.18926/44498
FullText URL mfe_045_036_045.pdf
Author Kanatani, Kenichi| Niitsuma, Hirotaka|
Abstract We present a new method for optimally computing the 3-D rotation from two sets of 3-D data. Unlike 2-D data, the noise in 3-D data is inherently inhomogeneous and anisotropic, reflecting the characteristics of the 3-D sensing used. To cope with this, Ohta and Kanatani introduced a technique called “renormalization”. Following them, we represent a 3-D rotation in terms of a quaternion and compute an exact maximum likelihood solution using the FNS of Chojnacki et al. As an example, we consider 3-D data obtained by stereo vision and optimally compute the 3-D rotation by analyzing the noise characteristics of stereo reconstruction. We show that the widely used method is not suitable for 3-D data. We confirm that the renormalization of Ohta and Kanatani indeed computes almost an optimal solution and that, although the difference is small, the proposed method can compute an even better solution.
Publication Title Memoirs of the Faculty of Engineering, Okayama University
Published Date 2011-01
Volume volume45
Start Page 36
End Page 45
ISSN 1349-6115
language 英語
Copyright Holders Copyright © by the authors
File Version publisher
NAID 80021759250
JaLCDOI 10.18926/48125
FullText URL mfe_046_001_009.pdf
Author Kanatani, Kenichi| Niitsuma, Hirotaka|
Abstract We optimally estimate the similarity (rotation, translation, and scale change) between two sets of 3-D data in the presence of inhomogeneous and anisotropic noise. Adopting the Lie algebra representation of the 3-D rotational change, we derive the Levenberg-Marquardt procedure for simultaneously optimizing the rotation, the translation, and the scale change. We test the performance of our method using simulated stereo data and real GPS geodetic sensing data. We conclude that the conventional method assuming homogeneous and isotropic noise is insufficient and that our simultaneous optimization scheme can produce an accurate solution.
Publication Title Memoirs of the Faculty of Engineering, Okayama University
Published Date 2012-01
Volume volume46
Start Page 1
End Page 9
ISSN 1349-6115
language 英語
Copyright Holders Copyright © by the authors
File Version publisher
NAID 80022451620
JaLCDOI 10.18926/48127
FullText URL mfe_046_021_033.pdf
Author Kanatani, Kenichi| Niitsuma, Hirotaka|
Abstract Because 3-D data are acquired using 3-D sensing such as stereo vision and laser range finders, they have inhomogeneous and anisotropic noise. This paper studies optimal computation of the similarity (rotation, translation, and scale change) of such 3-D data. We first point out that the Gauss-Newton and the Gauss-Helmert methods, regarded as different techniques, have similar structures. We then combine them to define what we call the modified Gauss-Helmert method and do stereo vision simulation to show that it is superior to either of the two in convergence performance. Finally, we show an application to real GPS geodetic data and point out that the widely used homogeneous and isotropic noise model is insufficient and that GPS geodetic data are prone to numerical problems.
Publication Title Memoirs of the Faculty of Engineering, Okayama University
Published Date 2012-01
Volume volume46
Start Page 21
End Page 33
ISSN 1349-6115
language 英語
Copyright Holders Copyright © by the authors
File Version publisher
NAID 80022451622
JaLCDOI 10.18926/OLR/54889
Title Alternative Several Points of Issue on the Informed Consent-An Analysis of a Model Case from the Aspect of Comparative Law
FullText URL olr_018_015_046.pdf
Author Yamashita|
Publication Title Okayama Law Review
Published Date 2017-03
Volume volume18
Start Page 15
End Page 46
ISSN 1881-1485
language 日本語
File Version publisher
NAID 120006026943
JaLCDOI 10.18926/okadaironkou/59986
Author 西山 康一| 荒井 真理亜|
Publication Title 岡大国文論稿
Published Date 2019-03-31
Issue issue47
Start Page 16
End Page 35
ISSN 0386-3123
language 日本語
File Version publisher
NAID 40021947356
JaLCDOI 10.18926/okadaironkou/60022
FullText URL okadaironkou_43_18_32.pdf
Author 羽原 卓也| 西山 康一| 山本 秀樹|
Publication Title 岡大国文論稿
Published Date 2015-03-31
Issue issue43
Start Page 18
End Page 32
ISSN 0386-3123
language 日本語
File Version publisher
NAID 40020533643
JaLCDOI 10.18926/okadaironkou/60030
FullText URL okadaironkou_42_39_54.pdf
Author 羽原 卓也| 西山 康一| 山本 秀樹|
Publication Title 岡大国文論稿
Published Date 2014-03-31
Issue issue42
Start Page 39
End Page 54
ISSN 0386-3123
language 日本語
File Version publisher
NAID 40020144376
JaLCDOI 10.18926/okadaironkou/60035
FullText URL okadaironkou_41_15_29.pdf
Author 西山 康一| 庄司 達也|
Publication Title 岡大国文論稿
Published Date 2013-03-31
Issue issue41
Start Page 15
End Page 29
ISSN 0386-3123
language 日本語
File Version publisher
NAID 40019753070
Author Ando, Mikayo|
Published Date 2008-10-25
Publication Title 岡山大学教育学部研究集録
Volume volume139
Issue issue1
Content Type Departmental Bulletin Paper
JaLCDOI 10.18926/14406
Title Alternative Psychoeducational approach to prevent emotional and behavioral problems among forth graders in an elementary school
FullText URL 008_089_098.pdf
Author Ando, Mikayo|
Abstract 青少年の情緒的および行動上の問題を予防するための心理教育的アプローチとして、心の健康教室プログラム“サクセスフル・セルフ”を開発し、小学校高学年の児童、中学生を中心に実施している。本研究では、このプログラムを小学4年生に実施し、その評価を行った。プログラム前から後の心理社会的要因、情緒的および行動上の問題に関する要因の変化を検討したところ、男女とも「衝動性・攻撃性」、「いじめ」、「身体的いじめ加害」、「言語的いじめ加害」、「仲間はずれ加害」、「身体的いじめ被害」、「無視被害」、「仲間はずれ被害」、「夜遊び」、「落ち込み」、「泣く・泣きたい」、「不眠」において、有意な減少が見られた。プログラム後の児童の感想から、自己理解、他者理解、自分の気持ちを話して気分が楽になる体験の場になったことが示唆された。引き続きの検討が必要と考えられるが、本プログラムの祥がう4年生への学級での実施は可能で、主にいじめや抑うつ状態に建設的な変化をもたらすことが推測された。
Abstract Alternative A psychoeducational program entitled, "Successful Self", has been developed and administered to students from the fifth grade through junior high school grades to prevent emotional and behavioral problems. The objective of this study was to evaluate this program when administered to fourth grade elementary students. Emotional and behavioral problems including "aggressiveness and impulsiveness", "physical and verbal bullying", "staying out late at night", "depression", "sleeplessness", "exclusion", and "crying" significantly decreased from pre to post interventions. The students' impressions indicated that the program helped them better understand themselves as well as others in communicating their problematical feelings. It is suggested that this psychoeducational program be administered to fourth grade students in an effort to lessen bullying and depression.
Keywords 問題行動 (Problem behavior) いじめ (depression) 抑うつ状態 (bullying) 小学生 (primary school students) 心理教育 (psychoeducation)
Publication Title 岡山大学教育実践総合センター紀要
Published Date 2008-03-10
Volume volume8
Issue issue1
Start Page 89
End Page 98
ISSN 1346-3705
language 日本語
File Version publisher
NAID 120002308421
Author Ando, Mikayo|
Published Date 2009-10-21
Publication Title 岡山大学大学院教育学研究科研究集録
Volume volume142
Content Type Departmental Bulletin Paper
Author Ando, Mikayo| Asakura, Takashi| Gabriele Giorgi|
Published Date 2009-06-25
Publication Title 岡山大学大学院教育学研究科研究集録
Volume volume141
Content Type Departmental Bulletin Paper
Author Ando, Mikayo|
Published Date 2010-02-25
Publication Title 岡山大学大学院教育学研究科研究集録
Volume volume143
Content Type Departmental Bulletin Paper
JaLCDOI 10.18926/19997
Title Alternative Psychosocial factors associated with eating behavior among junior high school students: A focus group interview approach
FullText URL 010_001_010.pdf
Author Tomioka, Yoshiko| Ando, Mikayo|
Abstract 本研究の目的は、中学生を対象に肥満度別にフォーカスグループインタビュー調査を行い、肥満と痩身に関わる摂食行動の心理社会的要因を検討することである.「日常の摂食行動に影響を与えている要因」「摂食行動の変化に影響を与えている要因」「食に対する意識」「家族からの影響」について、発言内容のカテゴリー分析を行った結果、摂食行動は「家族や他者との関係」「食や健康に対する認知」「体型に対する認知と満足感」「ストレス」と関連することが示唆された.また、痩身群に情緒と関連づける傾向が見られたこと、標準群と肥満群に体型への関心が見られたこと、痩身群と肥満群に体型に対して周囲からの体型是正に向けた働きかけが見られたことは、肥満度による特徴と考えられた.健康的な摂食行動を行う能力を育てる上でこれらを踏まえた食教育や心理教育的アプローチを行う必要性があると考えられた.
Abstract Alternative The objective of this study was to identify psychosocial factors involved in eating behaviors associated with obesity and thinness through focus group interviews among junior high school students in three separate categories: obesity, thinness, and normal weight. Students were interviewed and questioned about factors influencing their daily eating habits; factors influencing changes of eating behavior; factors influencing eating behavior due to family thinking and attitudes. The contents of the interviews were analyzed in all three categories, and the results showed that eating behaviors among junior high school students were associated with personal and family relationships, stress, cognition of eating and health, and cognition and satisfaction on the body. Furthermore, the students in the thinness category displayed tendencies in eating behavior to be associated with emotional factors. The normal weight category of students and the obesity category were more interested in their bodies. The obesity group and the thinness group were approached to change their bodies by others. From these interviews in the three weight categories, it was suggested that basic eating information and psychoeducational approaches to improve healthy eating behavior were needed.
Keywords 中学生 (junior high school students) 摂食行動 (eating behavior) 心理社会的要因 (psychosocial factors) フォーカスグループインタビュー (focus group interview)
Publication Title 岡山大学教育実践総合センター紀要
Published Date 2010-03-10
Volume volume10
Issue issue1
Start Page 1
End Page 10
ISSN 1346-3705
language 日本語
Copyright Holders 岡山大学教育学部附属教育実践総合センター
File Version publisher
NAID 120002309137
JaLCDOI 10.18926/19998
Title Alternative Psychosocial stress in school life and its psychoeducational approach among elementary school students
FullText URL 010_011_020.pdf
Author Okazaki, Yumiko| Ando, Mikayo|
Abstract 小学生の学校生活におけるストレスの実態を明らかにするために,小学校5,6年生2,486名を対象に,調査を行った。その結果,友達関係が,ストレッサーにも,ストレスコーピングにもなっていた。そこで,友達関係に着目し,ストレスを軽減することをねらいとした心理教育的プログラムを作成しその効果について評価を行った。対象は,小学5年生2学級58人である。プログラムを行った群(介入群),同じ時期にプログラムを行わなかった群(統制群)の2群に分け,介入群がプログラムを行った前後に,両群ともストレスに関する調査を実施した。その結果,介入群でも統制群でも,プログラム前から後で「情緒不安定」「集中力低下」「抑うつ」「身体症状」の有意な減少がみられた。プログラム後の児童の感想から,自己理解,他者理解,学習したことの生活での応用への意欲,友達関係向上への期待が持てる場になったことが示唆された。
Abstract Alternative The objective of this study was to clarify the prevalence of stress which is related to school life among elementary school students. Two thousand, four hundred and eighty-six (N=2,486) elementary school students between 5th and 6th grades completed a self-reported questionnaire. Factors of stressor, physical and psychological stress responses and stress coping were investigated. The results showed that the students experienced interpersonal relationships with friends as not only stressor but also stress coping. Based on these results, a school-based psychoeducational program to prevent stress in school life among elementary school students was developed. The second objective of this study was to evaluate the impact of the program. Fifty-eight (N=58) 5th graders were enrolled in the program and completed Time 1 and Time 2 surveys. The program was implemented in one class between Time 1 and Time 2 surveys (Intervention group), but it was not implemented in the other class between Time 1 and Time 2 surveys (Control group). Both groups reported significant improvement in stress responses concerning emotional status, concentration, depressive status, and physical status. The students responded positively toward understanding themselves and others, being motivated to better handle stress in their own lives, and establishing adequate relationships with friends.
Keywords 小学生 (elementary school students) 学校生活 (school life) 心理社会的ストレス (psychosocial stress) 心理教育的アプローチ (psychoeducational approach)
Publication Title 岡山大学教育実践総合センター紀要
Published Date 2010-03-10
Volume volume10
Issue issue1
Start Page 11
End Page 20
ISSN 1346-3705
language 日本語
Copyright Holders 岡山大学教育学部附属教育実践総合センター
File Version publisher
NAID 120002309134